DSS V7 bad Performance

[bwb]

I did not activate the replication feature.
I've just ticked the replication parameter on the volume group. i run only 1 V7 DSS for the moment.
Ticket is opened to get this update.

[Alex-Joda]

If you check the replication feature on the volume group it cost you nearly 2/3 of the performance compared to a VG without this checked. This is especially the case for IOPS. This happens regardless of running a replication task or not. We tested that very intense with some SSDs in a RAID 0 configuration, where you can see some nice IOPS numbers without replication and a hefty penalty after activating it. This is a sad thing because the active-active feature relies on the replication and this is the most important new feature of DSS7. Hopefully this will improve with newer versions....

[Al-S]

When using some specific settings, with V7, the performance compared with V6 is dropped down. And we are working on this issue and we will fix it very soon.
As mentioned, not all users with V7 or A/A (active - active) will face this issue. And in urgent cases, you can use V6 at the moment tell we update this issue and fix it.

[JMC-Software]

Do you enabled Caching on the RAID controller?

We have the same performence issue with replication and failover.

IOMETER: (OpenPerformenceTest - Max Throughput 100% Read )
500 GB LUN, Block, Test on a Hyper-V Server

IOPS, MBPS, Response Time
Only one SAN, 17368.182502,542.755703,3.263848
with Replication: 15586.519347,487.07873,3.664976
with Failover: 15373.858457,480.433077,3.790156

[bwb]

i am using adaptative read ahead and write back on the controllers.
my problem is not solved at this time.

[Gr-R]

to optimize the raid:
-write policy: write-back caching
-read policy: read ahead
-Cache Policy: Cached
-Disk cache policy: Enabled

[JMC-Software]

Could you do an IOMETER test? Try to do a test without vr and with vr.
http://kb.open-e.com/How-to-dramatic...ance_1293.html